Ay, alam ko yan sobrang nakaka-stress! Honestly, mas common pa yung false positive kesa false negative, but it can happen talaga, some of us had friends na delayed lang ang hormones or low levels muna, tapos after a few days or weeks, positive na agad. Kaya kung negative ang serum pero feeling mo talaga may symptoms (delayed period, breast tenderness, nausea), I'd really suggest ulit-ulitin after a few days or better yet, check with your OB para sure na, kasi alam mo naman parang guessing game lang if walang professional check. Fingers crossed for you, mama!